@article{8419812c03864672a285ead425afd8e1,
title = "On the shortening of Indian summer monsoon season in a warming scenario",
abstract = "Assessing the future projections of the length of rainy season (LRS) has paramount societal impact considering its potential to alter the seasonal mean rainfall over the Indian subcontinent. Here, we explored the projections of LRS using both historical and Representative Concentration Pathways 8.5 (RCP8.5) simulations of the Coupled Model Intercomparison Project Phase5 (CMIP5). RCP8.5 simulations project shortening of the LRS of Indian summer monsoon by altering the timing of onset and withdrawal dates. Most CMIP5 RCP8.5 model simulations indicate a faster warming rate over the western tropical Indian Ocean compared to other regions of the Indian Ocean. It is found that the pronounced western Indian Ocean warming and associated increase in convection results in warmer upper troposphere over the Indian Ocean compared to the Indian subcontinent, reducing the meridional gradient in upper tropospheric temperature (UTT) over the Asian summer monsoon (ASM) domain. The weakening of the meridional gradient in UTT induces weakening of easterly vertical wind shear over the ASM domain during first and last phase of monsoon, facilitate delayed (advanced) monsoon onset (withdrawal) dates, ensues the shortening of LRS of the Indian summer monsoon in a warming scenario.",
keywords = "CMIP5, Global warming, Indian summer monsoon, Length of rainy season, Onset and withdrawal dates, RCP8.5",
author = "Sabeerali, {C. T.} and Ajayamohan, {R. S.}",
note = "Funding Information: The Center for prototype Climate Modeling is fully supported by the Abu Dhabi Government through New York University Abu Dhabi Research Institute Grant. This research is supported by the Monsoon Mission project of the Earth System Science Organization, Ministry of Earth Sciences (MoES), Government of India (Grant No. MM/SERP/NYU/2014/SSC-01/002). We acknowledge the support from Dr. M. Rajeevan (MoES) and Dr. Suryachandra A Rao (IITM). We also thank CPCM scientists Dr. S. Sandeep and Dr. V. Praveen for their timely assistance in downloading CMIP5 datasets. We acknowledge the World Climate Research Programme{\textquoteright}s Working Group on Coupled Modelling, which is responsible for CMIP, and we thank the climate modeling groups (listed in Table 1 of this paper) for producing and making available their model output. For CMIP, the US Department of Energys Program for Climate Model Diagnosis and Intercomparison provides coordinating support and led the development of software infrastructure in partnership with the Global Organization for Earth System Science Portals. We thank the NCAR for making available the NCAR Command Language (NCL). We also thank the Editor and two anonymous reviewers for their time and valuable suggestions. Funding Information: Acknowledgements The Center for prototype Climate Modeling is fully supported by the Abu Dhabi Government through New York University Abu Dhabi Research Institute Grant. This research is supported by the Monsoon Mission project of the Earth System Science Organization, Ministry of Earth Sciences (MoES), Government of India (Grant No. MM/SERP/NYU/2014/SSC-01/002). We acknowledge the support from Dr. M. Rajeevan (MoES) and Dr. Suryachan-dra A Rao (IITM). We also thank CPCM scientists Dr. S. Sandeep and Dr. V. Praveen for their timely assistance in downloading CMIP5 datasets. We acknowledge the World Climate Research Programme{\textquoteright}s Working Group on Coupled Modelling, which is responsible for CMIP, and we thank the climate modeling groups (listed in Table 1 of this paper) for producing and making available their model output. For CMIP, the US Department of Energys Program for Climate Model Diagnosis and Intercomparison provides coordinating support and led the development of software infrastructure in partnership with the Global Organization for Earth System Science Portals. We thank the NCAR for making available the NCAR Command Language (NCL). We also thank the Editor and two anonymous reviewers for their time and valuable suggestions. Publisher Copyright: {\textcopyright} 2017, Springer-Verlag Berlin Heidelberg.",
year = "2018",
month = mar,
day = "1",
doi = "10.1007/s00382-017-3709-7",
language = "English (US)",
volume = "50",
pages = "1609--1624",
journal = "Climate Dynamics",
issn = "0930-7575",
publisher = "Springer Verlag",
number = "5-6",
}